Show "submittable" checkmarks in submitted together list

Feature: Issue 5276
Change-Id: I7fea3a414ae22ba07588129914c73fa040413692

polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-changes-list.html

@@ -79,6 +79,13 @@ limitations under the License.
       .submittable {
         color: #1b5e20;
       }
+      .submittableCheck {
+        color: #388E3C;
+        display: none;
+      }
+      .submittableCheck.submittable {
+        display: inline;
+      }
       .hidden,
       .mobile {
         display: none;
@@ -124,6 +131,10 @@ limitations under the License.
                 title$="[[change.project]]: [[change.branch]]: [[change.subject]]">
               [[change.project]]: [[change.branch]]: [[change.subject]]
             </a>
+            <span
+                tabindex="-1"
+                title="Submittable"
+                class$="submittableCheck [[_computeLinkClass(change)]]">✓</span>
           </div>
         </template>
       </section>

polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-changes-list.js

@@ -176,9 +176,14 @@
     },
 
     _computeLinkClass(change) {
+      const statuses = [];
       if (change.status == this.ChangeStatus.ABANDONED) {
-        return 'strikethrough';
+        statuses.push('strikethrough');
       }
+      if (change.submittable) {
+        statuses.push('submittable');
+      }
+      return statuses.join(' ');
     },
 
     _computeChangeStatusClass(change) {